Convert AVI to MKV online in seconds — free, with no sign-up. MKV is lossy and ideal for archiving films with multiple tracks; converted to MP4 for compatibility. Your files are encrypted and deleted automatically after 24 hours.
AVI
Audio Video Interleave — An older Microsoft container with large file sizes and limited modern support.
MKV
Matroska Video — A flexible container that holds multiple audio, video and subtitle tracks.
How to convert AVI to MKV
- 1Upload your AVI file
Click “Choose a file” or drag and drop your AVI file onto the page — no sign-up or email needed.
- 2Convert to MKV
MKV is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your MKV file
Your MKV file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
AVI vs MKV
| AVI | MKV | |
|---|---|---|
| Full name | Audio Video Interleave | Matroska Video |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | legacy video; usually converted to MP4 or WebM | archiving films with multiple tracks; converted to MP4 for compatibility |
Frequently asked questions
Does converting AVI to MKV lose quality?
Both AVI and MKV use compression, so re-encoding discards a little more data. For a single conversion the change is virtually invisible; just avoid repeatedly re-converting the same file.
What's the difference between AVI and MKV?
Audio Video Interleave (AVI) is lossy and best for legacy video; usually converted to MP4 or WebM. Matroska Video (MKV) is lossy and best for archiving films with multiple tracks; converted to MP4 for compatibility. Convert AVI to MKV when you need a video for archiving films with multiple tracks.
Is the AVI to MKV converter free?
Yes — converting AVI to MKV is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my AVI files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert AVI to MKV on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert AVI to MKV?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert AVI files to?
Besides MKV, you can convert AVI to AAC, FLAC, FLV, GIF, JPG, M4A and more — see the full list of AVI conversions below.
Other conversions
Last updated July 2026